Of course you can, I think your issue here is in the installation of the software applications? Play only allows you to install to one device at a time, but you should see both tablets in the install drop down menu, let it install on one and then click the "Installed" button and it should present the same menu to select a device, select the seconds tablet and let it install. If you go to the Play Store and select Settings, you should be able to see all your devices associated with your account and the time of last activity, and there is a tick box to either show/hide in the menus, so make sure both tablets are there and ticked to show.